Concealment of intermittent mono reception of FM stereo radio receivers

摘要

The present invention relates to audio signal processing. In particular, it relates to a method and system for reliably concealing intermittent mono reception of FM stereo radio receivers. The system comprises a parametric stereo parameter estimation stage configured to determine a first parametric stereo parameter based on a first frame of the received two-channel audio signal. The system further comprises a concealment detection stage configured to determine an energy of a side signal within the first signal frame; determine a number of following successive signal frames during which the energy of the side signal drops from a value above the high threshold to a value below a low threshold; determine that the two-channel audio signal following the first signal frame is a forced mono signal if the number of successive signal frames is below a frame threshold; and determine the parametric stereo parameter based on the first parametric stereo parameter.

主权项

1. A system configured to determine a parametric stereo parameter from a two-channel audio signal and configured to process frames of the two-channel audio signal using the parametric stereo parameter to generate a noise reduced two-channel audio signal; the system comprising:
a parametric stereo parameter estimation stage configured to determine a first parametric stereo parameter based on a first frame of the received two-channel audio signal; and a concealment detection stage configured to determine an energy of a side signal within the first signal frame; wherein the side signal is obtainable from the two-channel audio signal and wherein the energy is above a high threshold; determine a transition period of a number of following successive signal frames during which the energy of the side signal drops from a value above the high threshold to a value below a low threshold; determine that the two-channel audio signal following the first signal frame is a forced mono signal if the number of successive signal frames of the transition period is below a frame threshold; and determine the parametric stereo parameter for the processing of frames of the two-channel audio signal succeeding the first signal frame based on the first parametric stereo parameter, if it is determined that the two-channel audio signal following the first signal frame is a forced mono signal, wherein the system is carried out by one or more processors and/or one or memory devices.